<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        html {
            background-color:yellowgreen; 
        }
    </style>
</head>
<body>
    <form action="http://127.0.0.1:8080" enctype="application/x-www-form-urlencoded">
        <input type="text" name="userName">
    </form>
</body>
</html>